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INSTALLATION AND SERVICE MANUAL

OUTDOOR ROOFTOP GAS-FIRED DUCT FURNACE

(NATURAL OR POWER VENTED)

RISM-14

J30-05380

ATTENTION: READ THIS MANUAL AND ALL LABELS ATTACHED TO THE UNIT CAREFULLY BEFORE

ATTEMPTING TO INSTALL, OPERATE OR SERVICE THESE UNITS! CHECK UNIT DATA PLATE FOR

TYPE OF GAS AND ELECTRICAL SPECIFICATIONS AND MAKE CERTAIN THAT THESE AGREE WITH

THOSE AT POINT OF INSTALLATION. RECORD THE UNIT MODEL AND SERIAL No.(s) IN THE SPACE

PROVIDED. RETAIN FOR FUTURE REFERENCE.

Unit No. Serial No.

FOR YOUR SAFETY

The use and storage of gasoline or other flammable vapors and liquids in open

containers in the vicinity of this appliance is hazardous.

INSTALLER'S RESPONSIBILITY

Installer Please Note: This equipment has been test fired and inspected. It has been

shipped free from defects from our factory. However, during shipment and installation,

problems such as loose wires, leaks or loose fasteners may occur. It is the installer's

responsibility to inspect and correct any problems that may be found.

SAVE THIS MANUAL

These units are certiﬁ ed by ETL for operation on either natural or propane gas.

Read this manual and all labels attached to the unit carefully before attempting to install, operate or

service the following unit models:*

Outdoor Rooftop Duct Furnaces: QV(RT/PV)- (100, 150, 200, 250, 300, 350, 400) (H)(M)

(RT = Natural Vent; PV = Power Vent)

*Look in the direction of the unit air ﬂ ow to determine whether the unit is right or left-hand accessible.

FOR YOUR SAFETY

If you smell gas:

1. Don’t touch electrical switches.

2. Extinguish any open ﬂ ame.

3. Immediately call your gas supplier.

Improper installation, adjustment, alteration, service or maintenance

can cause property damage, injury or death. Read the installation, operating and

maintenance instructions thoroughly before installing or servicing this equipment.

Install, operate and maintain unit in accordance with manufacturer's

instructions to avoid exposure to fuel substances or substances from incomplete

combustion which can cause death or serious illness. The state of California

has determined that these substances may cause cancer, birth defects, or other

reproductive harm.

04/13

260 NORTH ELM ST., WESTFIELD, MA 01085

TEL: (413) 568-9571 FAX: (413) 562-8437

www.mestek.com

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Shrnutí obsahu

Strany 1 - (NATURAL OR POWER VENTED)

INSTALLATION AND SERVICE MANUALOUTDOOR ROOFTOP GAS-FIRED DUCT FURNACE (NATURAL OR POWER VENTED)RISM-14 J30-05380ATTENTION: READ THIS MANUAL AND ALL LA

Strany 2

– 10 –UNIONNIPPLENIPPLEELBOWELBOWNIPPLEUNIONNIPPLED3726The appliance must be isolated from the gas supply piping system by closing its individual manu

Strany 3 - GENERAL SAFETY INFORMATION

– 11 –GAS CONNECTIONS (continued) For the most satisfactory piping installation, the following procedure should be followed. Make piping layout of the

Strany 4 - SPECIFICATIONS

– 12 –Nominal Iron Pipe SizeInternalDia.Maximum Capacity of Pipe in Cubic Feet of Gas per Hour for Gas Pressures of 0.5 psig (3.5 kPa) or Less, and a

Strany 5

– 13 –OPERATIONGENERALAll units are equipped with intermittent pilot ignition systems. This system is 100% pilot burner shut off. See Figure 11 for bu

Strany 6 - PERFORMANCE DATA CURVES

– 14 –OPERATION continuedCONTROLSElectronic modulating gas firing is available from the factory on natural and propane gas units. Do not use a thermos

Strany 7 - BYPASS SIZING INFORMATION

– 15 –GAS CONTROLSSINGLE STAGE CONTROLGas heating units are factory provided with an automatic single-stage gas valve. This valve is an on/off type co

Strany 8 - INSTALLATION

– 16 –AIR DISTRIBUTIONTwo basic air control systems are used to deliver conditioned air to the occupied space: “constant” fan operation and “intermitt

Strany 9 - Neoprene Washers

– 17 –934211642140421634218642210422334228042302433264237242405450546054705480549054100541205413055140541605493421164214042163421864221042233422804228

Strany 10 - GAS CONNECTIONS

– 18 –1. With unit ﬁ ring, remove the pilot adjustment cap.2. Adjust the pilot screw to provide properly sized ﬂ ame.PILOT ADJUSTMENT3. A proper pi

Strany 11 - GAS CONNECTIONS (continued)

– 19 –Before starting the rooftop gas heating unit, use the “Installation Check Sheet” (found at the end of this manual) in conjunction with the proce

Strany 12 - ELECTRICAL CONNECTIONS

– 2 –TABLE OF CONTENTSRECEIVING/PRE-INSTALLATION INSTRUCTIONS ...2GENERAL SAFETY INFORMATION ...

Strany 13 - OPERATION

– 20 –MAINTENANCE Open all disconnect switches and secure in that position before servicing unit. Failure to do so may result in personal injury or d

Strany 14 - CONTROLS

– 21 –Figure 13 - Natural Vent Duct FuranceFigure 14 - Power Vent Duct Furnace

Strany 15 - GAS CONTROLS

– 22 –Chart 6 - TroubleshootingSYMPTOMSA. Gas odor.B. Delayed ignition.C. Pilot will not light, or will not stay lit.D. Main burners will not

Strany 16 - AIR THROUGHPUT

– 23 –Chart 6 - Troubleshooting continuedSYMPTOMSD. Main burners will not light. continuedE. Flame lifting from burner ports.F. Flame pops back.

Strany 17 - LIGHTING

– 24 –Chart 6 - Troubleshooting continuedSYMPTOMSJ. Floating ﬂ ame.K. Burner won't turn off.L. Rapid burner cycling.M. Not enough heat.POSSIBL

Strany 18 - GAS INPUT ADJUSTMENT

– 25 –Chart 6 - Troubleshooting continuedPOSSIBLE CAUSES 1. Thermostat malfunction. 2. Heater runs continuously. a. Improper thermostat or

Strany 19 - START-UP

– 26 –SERVICE NOTEDue to the many conﬁ gurations, options and voltage characteristics available on Outdoor Duct Furnaces, the information provided in

Strany 20 - MAINTENANCE

– 27 –NOTES:

Strany 21

Remarks: _____________________________________________________________________________________________________________________________________________

Strany 22

– 3 –The venting is an integral part of the unit and must not be altered in the field. The Natural Vented units are equipped with a vent cap which is

Strany 23

– 4 –Figure 1 - Standard Natural Vented Outdoor Duct FurnaceChart 1 - Dimensional/DataFigure 2 - Standard Power Vented Outdoor Duct Furnace CAPACITY

Strany 24

– 5 – F* NG LP INPUT OUTPUT Temp. Rise Min. Gas Gas Net Shipping CAPACITY RATING RATING EFF. MIN. MA

Strany 25 - *Q. Noisy power venter

– 6 –PERFORMANCE DATA CURVESFigure 3 - High Temperature Rise Duct Furnaces — 30-90°F (17-50°C)Figure 4 - Standard Temperature Rise Duct Furnaces — 20-

Strany 26 - LIMITED WARRANTY

– 7 –BYPASS SIZING INFORMATION(BUILT ON THE JOB – NOT FURNISHED BY FACTORY)On occassion when a duct furnace is incorporated in an air handling system,

Strany 27

– 8 –INSTALLATIONFigure 6 - Minimum Clearances to Combustible Material or Obstructions Open all disconnect switches and secure in that position before

Strany 28 - GAS EQUIPMENT

– 9 –*These Surfaces (indicated with an asterisk in ﬁ gures 8a & 8b) MUST be flush and sealed at all times to ensure the proper discharge of ﬂ ue